<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" 
  content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>

<div id="app">
  {{ msg}}
</div>

<script src="./vue.js"></script>

<script>
  const app = new Vue(
    {
      el:'#app',
      data:{
        msg:'我来了'
      }
    }
  )
</script>

</body>
</html>
      